Notes
FAA Office of Environment and Energy report dated March 16, 1990 explaining the adoption of DNL (Day Night Average Sound Level) as the standard aircraft noise descriptor under FAR Part 150, Airport Noise Compatibility Planning. Covers EPA’s 1976 formal recommendation of DNL, the Federal Interagency Committee on Urban Noise (1980), ANSI S3.23-1980, the Aviation Safety and Noise Abatement Act, and the scientific basis for DNL as an indicator of community annoyance. Discusses EPA Levels Document (550/9-74-004), single-event noise levels vs. cumulative exposure, and land use compatibility planning. Participating agencies include EPA, DOT, HUD, DOD, and the Veterans Administration.